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What does height really mean? Part 3 height systems / Thomas H. Meyer in Surveying and land information science, vol 66 n° 2 (01/09/2006)
[article]
Titre : What does height really mean? Part 3 height systems Type de document : Article/Communication Auteurs : Thomas H. Meyer, Auteur ; D.R. Roman, Auteur ; David B. Zilkoski, Auteur Année de publication : 2006 Article en page(s) : pp 149 - 160 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie
[Termes IGN] altitude dynamique
[Termes IGN] altitude normale
[Termes IGN] altitude orthométrique
[Termes IGN] cote géopotentielle
[Termes IGN] géoïde
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] North American Vertical Datum 1988Résumé : (Auteur) This is the third paper in a four-part series considering the fundamental question, “what does the word “height” really mean?” The first paper reviewed reference ellipsoids and mean sea level datums. The second paper reviewed the physics of heights culminating in a simple development of the geoid and explained why mean sea level stations are not all at the same orthometric height. This third paper develops the principle notions of height, namely measured, differentially deduced changes in elevation, orthometric heights, Helmert orthometric heights, normal orthometric heights, dynamic heights, and geopotential numbers. We conclude with a more in-depth discussion of current thoughts regarding the geoid. Copyright SaLIS Numéro de notice : A2006-471 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28195
in Surveying and land information science > vol 66 n° 2 (01/09/2006) . - pp 149 - 160[article]What does height really mean? Part 4 GPS heighting / Thomas H. Meyer in Surveying and land information science, vol 66 n° 3 (01/09/2006)
[article]
Titre : What does height really mean? Part 4 GPS heighting Type de document : Article/Communication Auteurs : Thomas H. Meyer, Auteur ; D.R. Roman, Auteur ; David B. Zilkoski, Auteur Année de publication : 2006 Article en page(s) : pp 165 - 183 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] ellipsoïde (géodésie)
[Termes IGN] géoïde altimétrique
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] nivellement par GPS
[Termes IGN] précision des donnéesRésumé : (Auteur) This is the final paper in a four-part series examining the fundamental question, “What does the word height really mean?” The creation of this series was motivated by the National Geodetic Survey’s (NGS) embarking on a height modernization program as a result of which NGS will publish measured ellipsoid heights and computed Helmert orthometric heights for vertical bench marks. Practicing surveyors will therefore encounter Helmert orthometric heights computed from Global Positioning System (GPS) ellipsoid heights and geoid heights determined from geoid models as their published vertical control coordinate, rather than adjusted orthometric heights determined by spirit leveling. It is our goal to explain the meanings of these terms in hopes of eliminating confusion and preventing mistakes that may arise over this change. The first paper in the series reviewed reference ellipsoids and mean sea level datums. The second paper reviewed the physics of heights culminating in a simple development of the geoid in order to explain why mean sea level stations are not all at the same orthometric height. The third paper introduced orthometric heights, geopotential numbers, dynamic heights, normal heights, and height systems. This fourth paper is composed of two sections. The first considers the stability of the geoid as a datum. The second is a review of current best practices for heights measured with the Global Positioning System (GPS), essentially taking the form of a commentary on NGS’ guidelines for high-accuracy ellipsoid and orthometric height determination using GPS. Copyright SaLIS Numéro de notice : A2006-582 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28305
in Surveying and land information science > vol 66 n° 3 (01/09/2006) . - pp 165 - 183[article]Voir aussiRéservation
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Code-barres Cote Support Localisation Section Disponibilité 121-06031 RAB Revue Centre de documentation En réserve L003 Disponible A quaternion-based geodetic datum transformation algorithm / Y.Z. Shen in Journal of geodesy, vol 80 n° 5 (August 2006)
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Titre : A quaternion-based geodetic datum transformation algorithm Type de document : Article/Communication Auteurs : Y.Z. Shen, Auteur ; Y. Chen, Auteur ; D.H. Zheng, Auteur Année de publication : 2006 Article en page(s) : pp 233 - 239 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] modèle non linéaire
[Termes IGN] quaternion
[Termes IGN] système de référence géodésique
[Termes IGN] transformation de coordonnéesRésumé : (Auteur) This paper briefly introduces quaternions to represent rotation parameters and then derives the formulae to compute quaternion, translation and scale parameters in the Bursa–Wolf geodetic datum transformation model from two sets of co-located 3D coordinates. The main advantage of this representation is that linearization and iteration are not needed for the computation of the datum transformation parameters. We further extend the formulae to compute quaternion-based datum transformation parameters under constraints such as the distance between two fixed stations, and develop the corresponding iteration algorithm. Finally, two numerical case studies are presented to demonstrate the applications of the derived formulae. Copyright Springer Numéro de notice : A2006-366 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-006-0054-8 En ligne : https://doi.org/10.1007/s00190-006-0054-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28090
in Journal of geodesy > vol 80 n° 5 (August 2006) . - pp 233 - 239[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-06071 RAB Revue Centre de documentation En réserve L003 Disponible 266-06072 RAB Revue Centre de documentation En réserve L003 Disponible On linear transformations of spatial data using the structured total least norm principle / Yaron Felus in Cartography and Geographic Information Science, vol 33 n° 3 (July 2006)
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Titre : On linear transformations of spatial data using the structured total least norm principle Type de document : Article/Communication Auteurs : Yaron Felus, Auteur Année de publication : 2006 Article en page(s) : pp 195 - 205 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] coordonnées géographiques
[Termes IGN] erreur de mesure
[Termes IGN] itération
[Termes IGN] système de coordonnées
[Termes IGN] transformation de coordonnées
[Termes IGN] transformation linéaireRésumé : (Auteur) Coordinate transformation is the process of converting spatial data from a source coordinate to a target coordinate system. A set of control points, measured in the two coordinate systems, is used to estimate the transformation parameters. In general, more control points are measured, and the over-determined system is adjusted using the least squares method. However, the standard least squares method assumes that errors exist only in the measurements made at one coordinate system, or at the observation vector (y). This is not the case in many physical systems where errors exist in all the measurements made in both the source coordinate and the target coordinate systems. The Structured Total Least Norm (STLN) method is a relatively new mathematical concept developed to solve estimation problems of so-called Error-In-Variables (EIV) models. The method is specifically suitable for dealing with transformation problems, since it can handle the special structure of the data matrix (A). The STLN method is uniquely used to compute the parameters of common linear coordinate transformations (affine and similarity). A numerical example is presented to demonstrate the superiority of this technique in terms of accuracy and to compare the standard LS method, the generalized LS algorithm, and the STLN approach. Copyright CaGISociety Numéro de notice : A2006-551 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1559/152304006779077273 En ligne : https://doi.org/10.1559/152304006779077273 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28274
in Cartography and Geographic Information Science > vol 33 n° 3 (July 2006) . - pp 195 - 205[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-06031 RAB Revue Centre de documentation En réserve L003 Disponible Approximate direct georeferencing in national coordinates / Klaus Legat in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 4 (June - July 2006)
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Titre : Approximate direct georeferencing in national coordinates Type de document : Article/Communication Auteurs : Klaus Legat, Auteur Année de publication : 2006 Article en page(s) : pp 239 - 255 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] coordonnées cartésiennes géocentriques
[Termes IGN] élément d'orientation externe
[Termes IGN] géoréférencement direct
[Termes IGN] GPS-INS
[Termes IGN] projection
[Termes IGN] transformation de coordonnéesRésumé : (Auteur) Direct georeferencing has gained an increasing importance in photogrammetry and remote sensing. Thereby, the parameters of exterior orientation (EO) of an image sensor are determined by GPS/INS, yielding results in a global geocentric reference frame. Photogrammetric products like digital terrain models or orthoimages, however, are often required in national geodetic datums and mapped by national map projections, i.e., in “national coordinates”. As the fundamental mathematics of photogrammetry is based on Cartesian coordinates, the scene restitution is often performed in a Cartesian frame located at some central position of the image block. The subsequent transformation to national coordinates is a standard problem in geodesy and can be done in a rigorous manner–at least if the formulas of the map projection are rigorous. Drawbacks of this procedure include practical deficiencies related to the photogrammetric processing as well as the computational cost of transforming the whole scene. To avoid these problems, the paper pursues an alternative processing strategy where the EO parameters are transformed prior to the restitution. If only this transition was done, however, the scene would be systematically distorted. The reason is that the national coordinates are not Cartesian due to the earth curvature and the unavoidable length distortion of map projections. To settle these distortions, several corrections need to be applied. These are treated in detail for both passive and active imaging. Since all these corrections are approximations only, the resulting technique is termed “approximate direct georeferencing”. Still, the residual distortions are usually very low as is demonstrated by simulations, rendering the technique an attractive approach to direct georeferencing. Copyright ISPRS Numéro de notice : A2006-280 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.02.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.02.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28007
in ISPRS Journal of photogrammetry and remote sensing > vol 60 n° 4 (June - July 2006) . - pp 239 - 255[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-06041 SL Revue Centre de documentation Revues en salle Disponible PermalinkThe use of second-generation wavelets to combine a gravimetric quasigeoid model with GPS-levelling data / A. Soltanpour in Journal of geodesy, vol 80 n° 2 (May 2006)PermalinkLes réseaux face aux contraintes locales / M. Mayo in Géomètre, n° 2025 (avril 2006)PermalinkApplication de l'approche par les équations de la régression multiple pour le passage d'un datum à l'autre (cas de l'Algérie) / A. Zeggai in XYZ, n° 106 (mars - mai 2006)PermalinkN48°26'58" : le plus long parallèle de France / K. Drame in XYZ, n° 106 (mars - mai 2006)PermalinkTeria et RGP, même combat / Anonyme in Géomatique expert, n° 49 (01/03/2006)PermalinkPermalinkPermalinkLong term consistency of multi-technique terrestrial reference frames, a spectral approach / Karine Le Bail (2006)PermalinkThe GPS permanent network in Romania, Volume 1. [Rapport en anglais avec annexes] / Pierre Valty (2006)Permalink